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A plenum chamber is a pressurised housing containing a gas or fluid (typically air) at positive pressure (pressure higher than surroundings). One function of the plenum is to equalise pressure for more even distribution, because of irregular supply or demand. A plenum chamber can also work as an acoustic silencer device. Examples of plenum chambers include those used with: * Superchargers * Hovercraft * Corliss steam engines * Raised floors and false ceilings in equipment rooms * Some organs (to supplement the bellows)〔 〕 * A number of aerophones, such as the bag of bagpipes and the ''slow air chamber'' of the Native American flute * Plenum Chamber Anesthetic Vaporizers * Rocket Motor Combustion Chambers. May have a section near the nozzle that is free of the propellant charge to improve mixing and combustion. == Etymology == The term "plenum" derives originally from classical theories and the notion that "Nature abhors a vacuum". These gave rise to the notion of 17th century 'plenum' as the opposite of vacuum, and all things "being either Plenum or Vacuum".〔 plenum〕 By the 19th century, the development of mechanical fans and industrial machinery had provided another, more technical use. This referred to "a system of artificial ventilation",〔 which used a pressure raised slightly above atmospheric pressure, in contrast to the "vacuum system" which used a pressure below atmospheric. At a time when high pressure steam or hydraulic systems were well established, these were a distinct set of systems based on low pressure and high volume flows. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「plenum chamber」の詳細全文を読む スポンサード リンク
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